Background image not visible in render

[Anonymous]

Hello,

I'm struggling for some time now with background image in rendering settings.
The thig is that it is not visible in the final render image - widows glass is greyed out, although it is visible on the preview in rendering settings panel.
Any idea how to change the render settings to to get it fix?

Thank you!

[Eduardo Rolon]

and TIFFs have always supported Alpha Masks.